Table 2 EDS results acquired on sample S2

From: Identification and cleaning of an onion-based residue in a historical layer of Giacomo Balla’s Ritratto d’uomo / Eugenio Riva

Spectrum

C

O

Mg

Al

Si

S

Cl

K

Ca

Ti

Fe

Zn

Spectrum 1

35.0

25.6

-

-

0.5

0.5

0.3

-

2.0

-

-

36.2

Spectrum 2

51.7

24.8

0.8

2.3

6.8

0.7

0.2

-

1.8

0.1

1.0

9.9

Spectrum 3

38.0

19.5

-

-

1.0

0.6

-

-

2.3

-

-

38.5

Spectrum 4

-

75.5

-

-

3.8

2.9

-

1.4

1.7

-

3.7

11.0

  1. All results in weight%. SD = ± 0.2.
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